An F-15 fighter jet crashed Monday after colliding in mid-air with another military jet during a training exercise, Air Force officials said. The other jet landed safely, and one was seriously injured.

The pilot of the F-15C ejected safely and was taken a military hospital, said Airman Jennifer Anton, a spokeswoman at Eielson Air Force Base near Fairbanks. The pilot did not have serious injuries, she said.

The pilot of the other jet, an F-16C that landed safely, was uninjured, she said.

It was not immediately clear why the two jets collided at 11:23 a.m. local time during a training exercise about 90 miles east of Fairbanks in Alaska's interior, Anton said. A board of Air Force officers will investigate.

The crash happened at the Pacific Alaska Range Complex, a 60,000-acre training ground.

The $27 million F-15C that crashed was from Langley Air Force Base, Va., and the F-16C was from Nellis Air Force Base, Nev.

The Alaska Air National Guard took the F-15C pilot to Bassett Army Hospital at Fort Wainwright, also near Fairbanks, said McHugh Pierre, a spokesman for the Alaska Department of Military and Veterans Affairs.

The training exercise includes more than 1,400 military members from the U.S., Singapore and Australia. The simulated combat exercise is scheduled to run through June 15, according to Eielson's Web site.